Pneumatic-motor for musical instruments



(No Model.)

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PNEUMATIOMOTOR FOR MUSICAL @wetsuit/Ecrire.

SPECIFICATION forming part ef Letters Patent ne. 594,981, dated neeember7, 1897. l Application filed March 17, 1397.l Serial No. 627,930. (Nomodel.)`

T all whom t may con/cern:

Be it known that 1, THEODORE YP. BROWN, a citizen of the United States,residing at Vorcester, in the county ofv Worcester and State ofMassachusetts, have invented a certain new, useful, and valuableImprovement in Pneumatic Motorsl for Musical Instruments, of which thefollowing is a full, clear, and exact description.-y

My invention relates to pneumatic motors for musical instruments, andparticularly to that class of motors whichV are employed in self-playing musical instruments; and the object of my invention is to provide amore practical and eiicient motor than any heretofore used.

In the accompanying drawings, which form a part of this specification,Figure 1 is a front elevation of my complete motor. Fig. 2 is atransverse vertical section of the same, taken through line 2 2 ofFig. 1. Fig. 3 is a longitudinal horizontal section taken through line 33 of Fig. 1, but showing only my slide-valve mechanism and connectingchannel-board.

N umerals of reference are placed upon or connected to the numerousparts shown in the drawings, like numerals of reference indicating thesame parts throughout the several views, and in the following detaileddescription corresponding numerals will be employed to indicate theparts referred to.

The entire motor mechanism is-supported from the foundation-board 1 bylegs 2, secured at their upper ends to the channel-board 3. Saidchannel-board 3 has a longitudinal channel or chamber 4 extending nearlyits entire length, being closed at one end and in communication with atube or'pipe 5 at its opposite end. Through the front of saidchannel-board 3 are three equidistant apertures or ports 5, leading intothe chamber 4, and directly under these are three other ports 6.Communicating with lthe main or longitudinal channel 4 in thechannel-board 3 are three supplemental air channels or ports 7, whichextend entirelythrough the said channel-board 3 and through theirrespective fixed bellows-boards into the bellows 9, having the movableboard l0. Working in guide-rails 11 are three sliding valve-boards12,connected to three differential cranks 13 14 15 in the shaft 16 bytheir pitman-rods 17, and said valveboards 12 having -recesses-18`formed in their inner surface Thefunction of said recess 18 in eachvalve-board isto connect the ports andv 6, so that when the valve-boardis lowered the recess 18 connects the' upper port 5 and lower port 6, sothat if the chamber 4 is kept under air-pressure, as in practice, itacts through the port 5Valve-board recess 13, port 6, channel 7, andport 8 upon the bellows 9, thus lcausing the closed bellows to expand.The pitman 19 is pivotally connected at one end .to the cleat 2O on thebellowsboard and at the opposite end to the crank 1 5, formed in shaft16, it being noted that 'each valve-board pitman 17 is pivotally securedto an extension-block 21 upon the said pitman 19, thus obviating morethan three ycrank-bends in the shaft 16.

The operation of my improvements are Obviously as follows: The pipe 5nis extended to 4a pressure-bellows or other suitable device,

which steadily impels air therethrough and keeps the channel 4 underpressure and tending to communicate with and expand the three bellows 9,as before described; but it can on/ly act on the one bellows whichhappens to Ee collapsed or closed, because it is only wh n a bellows isclosed that its slide-valve 12 is yin the proper position to allow theair to pass v from the chamber 4 through the recess 18 into theparticular closed bellows 9, which in turn acts upon the pitman-rod 19to revolve the shaft 16, and thus bring another bellows into a closedposition ready to be expanded, and so on until the third bellows isbrought into a closed position, whereupon each bellows in turn actspartially to revolve the main shaft 16. Vhen any particular bellows hasbeen expanded to its full extent, the recess 18 in the slide-valve 12has uncovered the port 6,

`which allows the compressed air within the bellows to escape and allowsthe bellows to be closed freely, as is clearly shown in Fig. 2.

My motor mechanism can be operated under the exhaust system simply bykeeping the chamber 4 exhausted and arranging the slidevalve 12 toconnect the chamber 4 with a particular bellows when the latter isopened to its fullest extent when the suction of air therefrom serves toclose it. For most purposes the exhaust system is preferable. v

By the successive operation of the three IOO bellows in the Vmannerdesoribed a perfectly regular and uniform revolution is given the mainshaft 16, the speed of revolution depending,` entirely upon the degreeof pressure or exhaust at which the Chamber 4L is kept, and this may beregulated in many Ways.

In order to propel the music-roller 22, I hinge or otherwise :rook ormake it movable7 so that its pinion 23 can readily be thrown into or outof mesh with a pinion 24, iXed upon one end of said revoluble shaft 16.

Having now described my invention and stated the manner in which it isto be used, what I claim as new, and desire to seeure by Letters Patent,is

In apneumatie motor, the Combination with a channel-board having mainand supplemental air-channels, each opening outward through the frontface of the board, of three -of the channel-board andeaeh bellows havingor more bellows arranged upon the rear face Witnesses:

WM. J. TAFT, RUFUS B. DODGE, Jr.

